970e51fead
Add stacktrace support for User Mode Linux Signed-off-by: Daniel Walter <dwalter@google.com> Signed-off-by: Richard Weinberger <richard@nod.at>
80 lines
2 KiB
C
80 lines
2 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright (C) 2013 Richard Weinberger <richard@nod.at>
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* Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kallsyms.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <asm/stacktrace.h>
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void dump_trace(struct task_struct *tsk,
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const struct stacktrace_ops *ops,
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void *data)
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{
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int reliable = 0;
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unsigned long *sp, bp, addr;
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struct pt_regs *segv_regs = tsk->thread.segv_regs;
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struct stack_frame *frame;
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bp = get_frame_pointer(tsk, segv_regs);
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sp = get_stack_pointer(tsk, segv_regs);
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frame = (struct stack_frame *)bp;
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while (((long) sp & (THREAD_SIZE-1)) != 0) {
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addr = *sp;
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if (__kernel_text_address(addr)) {
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reliable = 0;
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if ((unsigned long) sp == bp + sizeof(long)) {
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frame = frame ? frame->next_frame : NULL;
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bp = (unsigned long)frame;
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reliable = 1;
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}
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ops->address(data, addr, reliable);
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}
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sp++;
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}
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}
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static void save_addr(void *data, unsigned long address, int reliable)
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{
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struct stack_trace *trace = data;
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if (!reliable)
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return;
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if (trace->nr_entries >= trace->max_entries)
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return;
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trace->entries[trace->nr_entries++] = address;
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}
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static const struct stacktrace_ops dump_ops = {
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.address = save_addr
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};
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static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
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{
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dump_trace(tsk, &dump_ops, trace);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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void save_stack_trace(struct stack_trace *trace)
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{
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__save_stack_trace(current, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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__save_stack_trace(tsk, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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